TWI by Dustin Abbott:
Here's a single exposure RAW shot taken yesterday and processed normal workflow - this is all in LR4. I have definitely found that there is less banding when pulling up shadow detail and the graduation to highlights is also smoother compared to 5DII.

I do use HDR occasionally when shooting tough lighting scenes, but I have found already that there is enough dynamic range with the 6D that HDR shows little overall improvement. I'm impressed: